Definition of subgiant in English:

subgiant

noun

Astronomy
  • An evolved star which lies above the main sequence and below the giants on the Hertzsprung–Russell diagram, being less luminous than giant stars of the same temperature or spectral class.

Origin

1920s. From sub- + giant.

Pronunciation

subgiant

/ˈsʌbdʒʌɪənt/